Some interesting pictures have emerged of a very low take-off from what looks like 09R at LHR by a Sri Lankan A340.
Low flying Sri Lankan A340 causes concern at take off from Heathrow. | Demotix.com
According to ATI the take-off is under investigation by the AAIB:
"A late take-off performed by a SriLankan Airlines Airbus A340-300 from London Heathrow's runway 09R on 5 February, followed by a low climbing trajectory, may be under scrutiny by the UK authorities.
In response to a question from Flightglobal, the UK Air Accident Investigation Branch said only that it is investigating an incident on that date.
SriLankan Airlines was not immediately available to comment."